At the earth hour地球一小时 at the Earth Summit在地球峰会上 Looking at the Earth遥望地球 At the Earth‘s Core地心,地心记
在地球上,用 on the earth,而不能用at the earth . Satellites also aimed their transmissions at the Earth, with almost none being allowed to escape into space.卫星还将其信号传输指向地球,几乎不允许任何信号溜入太空.at 连接传输目标,有“到”的意思.
